Films for which no actors are required? (8)
I believe the answer is:
cartoons
'films' is the definition.
(cartoon is a kind of film)
'no actors are required?' is the wordplay.
'are required?' indicates anagramming the letters (letters required in a new form).
'no'+'actors'='noactors'
'noactors' is an anagram of 'CARTOONS'.
'for which' is the link.
(Other definitions for cartoons that I've seen before include "Humorous or satirical drawings" , "Amusing and often pointed drawings in newspapers" , "Animated films or humorous drawings" , "Comic drawings, may be animated" .)